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Solve the equation on the interval [0,2 pie) 2 cos 2x - square root of 3 = 0  

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nfc1538 | eNotes Newbie

Posted July 16, 2013 at 11:35 PM via web

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Solve the equation on the interval [0,2 pie)

2 cos 2x - square root of 3 = 0

 

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted July 17, 2013 at 12:18 AM (Answer #1)

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2cos2x-sqrt3 = 0

`cos2x = sqrt3/2`

`cos2x = cos(pi/6)`

`2x = 2npi+-pi/6`

`x = npi+-pi/12`

 

When n = 0 then `x = -pi/12` and `x = pi/12`

When n = 1 then `x = (11pi)/12` and `x = (13pi)/12`

When n = 2 then `x = (23pi)/12` and `x = (25pi)/12`

 

So the answers between 0 and `2pi ` are;`x = pi/12,(11pi)/12,(13pi)/12,(23pi)/12`

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